<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>{% block title %}默认{% endblock %} - 我的网站</title>
</head>
<body>
{% include 'nav.html' %}
{% block content %}这里是网站内容！{% endblock %}
{% include 'footer.html' %}
</body>
</html>